Prep vegetables.
Preheat oven to 350 F
Fill half of stock pot with water. Bring stove to high heat. and boil water. Add salt and a tbsp of olive oil.
While waiting for pasta to boil. Make the sauce. Heat sauce pan on medium heat. Melt the butter and a tbsp of olive oil. Sauté onions until color is translucent. Add garlic. Cook for 2-3 minutes.
Next is add the ground beef. Using a wooden spoon, break large chunks into smaller pieces. Cook until color is golden light brown.
Stir in truffle dust and parsley and cook for another minute.
Add flour. Mix it well until color changes to light brown. Pour in pasta water and milk. Squeeze in lemon. Stir mixture well. Let it boil for 10 minutes or until sauce thicken.
Cook pasta for 9-10 minutes or until al dente. Turn off heat. Drain pasta into strainer and place it back into the stock pot. Add in sauce. Toss pasta mixture.
Put pasta in casserole dish.
Heat sauce pan on medium heat. Add butter and olive oil. Stir in oyster crackers, parsley. Cook to light golden brown. Turn off heat. Add parmesan.
Layer topping on pasta. Cover entire surface if possible. Bake in oven for 10 minutes.
Serve on heat proof surface.